GUPTA, M. K.; JHA, M. N.; SINGH, R. P. Soil Chemical Properties of Silver Fir and Spruce forests under Different Systems of Silviculture. Indian Forester, [S. l.], v. 116, n. 11, p. 883–889, 1990. DOI: 10.36808/if/1990/v116i11/8946. Disponível em: http://indianforester.co.in/index.php/indianforester/article/view/8946. Acesso em: 4 dec. 2025.